Renewable Energy cannot become mainstream without Energy Storage. Put simply the wind may blow or the sun may shine when you don’t need it or it is not cost effective to sell. The reverse is also true. The times when the need for energy is high may correspond to times when the availability of the wind or sun may be low or nonexistent. Energy Storage allows owners and operators of power systems based on wind wave or solar, to forward sell power to maximise returns as there can now be certainty that power will be there to dispatch at the time designated. Energy Storage enables owners of renewable assets to better maximise the use of their assets. In wind systems this means being able to capture more of the available wind.